Definition: You are given a question on conceptual physics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Black is the combination of
(A)all the colors together (B)two or more appropriate colors (C)light when a prism is held upside down (D)None of these

D